Aerosols float like smoke, linger in poorly ventilated rooms, and are inhaled at short and long range. Droplets drop & are not inhaled. Break occurs at ~100 microns. We published a letter @ScienceMagazine on this based on @theNASEM workshop discussions.…
Medical masks block droplets. They leak aerosols (in both directions). To protect against aerosol inhalation at short and long range, wear a better mask--N95 (or better) in healthcare and KF94/KN95 in public.
And it is not just SARS-CoV-2 that is airborne-it is most other respiratory viruses. Is it really so surprising to hear that "respiratory viruses are inhaled" from the air (not surfaces!) and thus are airborne? See our recent review in @ScienceMagazine.…

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More from @kprather88

8 Oct
POTUS just said we need to vaccine all to end this pandemic. What about cleaning indoor air? Being on the offense and fixing the root cause of spread is so much better than being on defense (vaccines). In other words, it is much better to fix the cause than treat the symptoms.
To be clear, I am thinking of avoiding future pandemics. If we clean the air now, it reduces the chance of future indoor spread of other respiratory diseases. Now, we definitely need it all.
Read 4 tweets
7 Oct
Someone just sent me info on outbreak in a hospital break room where 14/15 got infected by 1 index case in one shift. The max in room at once time was 4. Warning: don’t take off mask just because people are not present. The virus can linger in the air in small spaces for hours.
The infectious staff worker had slight symptoms….
Another detail….all were doubly vaccinated with Pfizer in Feb 2021.
Read 6 tweets
29 Sep
If someone has test results showing their air cleaners work as claimed, they should publish them. Peer review is key to validation. In general, adding ions, plasmas, & oxidants to indoor air creates health concerns. See this recent review and refs:

These companies are coming out of the woodwork selling super expensive devices to schools and businesses. Their technology has not been validated in any acceptable way. They claim they have proven it works on web sites where anyone can say anything they want. This is not OK.(2/)
They are taking advantage of schools desperately trying to protect kids during a pandemic, thinking if they spend 10 times more, they will be protecting them even more. Not the case. Simple HEPA filtration and ventilation are all one needs to clean indoor air.
Read 4 tweets
23 Sep
Is "negativity" people begging her to address why she refuses to acknowledge the importance of airborne transmission and implement the precautionary principle (a major lesson from SARS1 in Canada)? People are getting infected unnecessarily. (1/)
As Chair, it is her job to examine the latest evidence. Misinformation? She is stating there is controversy--not true. All evidence to date points at airborne transmission. There is zero controversy by the experts who study transmission pathways and many MDs. (2/)
In terms of "negativity". I have been professional. She on the other hand has called many of us names including conspiracy theorists and accused of being in silos, etc. She is ignoring MANY pubs now showing the virus can be sampled from the air and it is indeed infectious.(3/)
Read 18 tweets
22 Sep
My very first personal Corsi Rosenthal box...250 more will be built tomorrow with @CBSNews @UCSanDiego. Gonna be a fun day!! Thanks @JimRosenthal4 for helping make it happen...also @DavidElfstrom @CorsIAQ
@LazarusLong13 has also helped compile info with @CleanAirCrewOrg to help guide many people…a major team effort.
Contraption for cutting 250 shrouds...13.5 inch hole.
Read 4 tweets
18 Sep
Some days it is so hard to believe that rather than protect against airborne transmission of SARS-CoV-2, healthcare and public health officials continue to treat is as droplet spread. All of the evidence we have on SARS-CoV-2 points to aerosol transmission-none to droplet. (1/4)
Healthcare workers are dying because of this failure to recognize the importance of aerosol transmission as described in Canada. It is happening worldwide. (2/4)

Canada dealt with original SARS-1. It hit two cities at the same time-Vancouver and Ontario. One wise doctor (@drfiliatrault) in Vancouver chose to treat it as airborne--and guess what, her hospital stopped it in its tracks. See story. (3/4)…
Read 8 tweets

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